[More questions about stun]

I played this game a few times, but still cannot understand stun mechanics clearly. I have the foollowing questions:

How stun damage, which can be taken by target before it is incapacitated, relates to it's hitpoints? Is this amount reduced when target's HP lowers?

Are there two separate amounts - normal HP and "stun HP", or normal HP defines, how many stun damage can be taken in one turn? If there are some sort of "stun HP" - is it regenerated? an how fast? If i throw a dozen of stun grenades at target and then end turn - such target would be easier to knock down at the nex turn, or all stun damage dealt will go in vain?

For example: i had soldier critically wounded (7/60 HP). Then he was incapacitaed when walked in stun gas cloud. If i heal him to 30 HP - could it prevent this?

[[V21 Stable Steam] Save that causes crash]

All my savegames were corrupted at once, after saving attempt. I tried to save on Geoscape, and had lots of UFO, and few aircrafts mid-air.

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